Digital CVSD telephone conference circuit

ABSTRACT

A six-telephone channel conference system features an all-digital CVSD (continuously variable slope delta modulation) conference bridge-like circuit. The delta modulation pulse train in each channel is transformed into a series of slope numbers which are processed by the conference circuit addition function to provide zero insertion loss, then by the subtraction function to provide 100% cancellation of a talker&#39;s voice to his ear. Transformation involves a sequential three-bit algorithm.

BACKGROUND OF THE INVENTION

The present invention relates to telephone conference bridges and moreparticularly to a digital telephone conference circuit.

SUMMARY OF THE INVENTION

An object of the present invention is to provide an all digital CVSD(continuously variable slope delta modulation) full duplex telephoneconference circuit.

Another object of the present invention is to provide an all digitalCVSD telephone conference circuit employing the three bit algorithm ofmy copending application Ser. No. 734,854, filed Oct. 22, 1976, now U.S.Pat. No. 4,091,452, whose disclosure is incorporated herein byreference.

Although described therein as a "CVSD Circuit", the concept for digitalinstantaneous slope addition works for any form of delta modulation. Theanalog-to-digital converter (encoder) and the digital-to-analogconverter (decoder) in any form of delta modulation perform thenecessary gain changes (if any) as well as determine the null signallevels. The circuit addition and subtraction functions work on thedigital bit streams only and rely on the decoders to establish the nullas well as reconstruct the analog signal. The operation of the additionfunction provides zero insertion loss and the subtraction functionyields 100% cancellation of a talker's voice to his ear.

A feature of the present invention is the provision of an all digitaldelta modulation telephone conference circuit comprising: first digitalmeans to separately store in succession a plurality of differentadjacent bits of a plurality of input delta modulation bit streams eachoriginating from a different one of a plurality of phones, each of theplurality of bits being capable of having a plurality of different bitcombinations, each of the plurality of different bit combinations beingassigned a predetermined slope number; and second digital means coupledto the first means for sequentially receiving each of the plurality ofbits, for adding sequentially first binary bit combinations determinedby the slope number assigned to each of the received plurality of bitsto produce a sum digital signal including information from each of thephones, and for subtracting sequentially second binary bit combinationsdetermined by the slope number assigned to each of the receivedplurality of bits from the sum digital signal to produce a plurality ofoutput conference delta modulation bit streams each for a different oneof the plurality of phones and each including information from all ofthe plurality of phones minus information from the associated one of theplurality of phones.

BRIEF DESCRIPTION OF THE DRAWING

Above-mentioned and other features and objects of this invention willbecome more apparent by reference to the following description taken inconjunction with the accompanying drawing, in which:

FIG. 1 is a basic block diagram of the CVSD telephone conference circuitin accordance with the principles of the present invention;

FIG. 2 is a logic diagram of the CVSD telephone conference circuit inaccordance with the principles of the present invention; and

FIG. 3 is a timing diagram useful in explaining the operation of thelogic diagram of FIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1 there is disclosed therein LSI (large scaleintegrated circuit) package of the all digital CVSD telephone conferencecircuit of the present invention to enable six telephones to have aconference. The conference circuit receives six baseband CVSD bitstreams, one from each of the phones A_(I) to F_(I), having a bit rateof 32 KBPS (kilobits per second). The conference circuit operates to addthe bits streams together and substract the bit stream of each phonefrom the added bit stream so that the intelligence of each phone is notreturned to itself on the conference bit steams A_(o) to F_(o). Theoperation of the CVSD telephone conference circuit of this inventionemploys the three bit algorithm of the above-cited copending applicationand provides the outputs A_(o) to F_(o) as set forth in the followingequations.

    A.sub.o =ΣB.sub.I ·C.sub.I ·D.sub.I ·E.sub.I ·F.sub.I

    b.sub.o =ΣA.sub.I ·C.sub.I ·D.sub.I ·E.sub.I ·F.sub.I

    c.sub.o =ΣA.sub.I ·B.sub.I ·D.sub.I ·E.sub.I ·F.sub.I

    d.sub.o =ΣA.sub.I ·B.sub.I ·C.sub.I ·E.sub.I ·F.sub.I

    e.sub.o =ΣA.sub.I ·B.sub.I ·C.sub.I ·D.sub.I ·F.sub.I

    f.sub.o =ΣA.sub.I ·B.sub.I ·C.sub.I ·D.sub.I ·E.sub.I

referring to FIG. 2 there is illustrated a logic diagram that would becontained in the package of FIG. 1 to provide an all digital CVSDtelephone conference circuit in accordance with the principles of thepresent invention. Each of the input CVSD bit streams of phones A_(I)and F_(I) are coupled to three cascade connected D-type flip flops, suchas flip flops 1-3 coupled to the input from phone A_(I). Two groups ofthree cascade connected D-type flip flops are present in one integratedcircuit, such as model 74C174 available from National Semiconductor.Flip flop 1 stores the present bit t, flip flop 2 stores the adjacentprevious bit t-1 and flip flop 3 stores the adjacent bit from theprevious bit t-2. The bits from the bit stream are shifted through flipflops 1-3 at a 32 KHz (kilohertz) rate by the 32 KHz clock (Curve J,FIG. 3) coupled from buffer 4. The three bits stored in flip flops 1-3can have eight different bit combinations each of which are assigned aslope number. The slope numbers are then added together to directly addtwo CVSD bit streams together. This is the basis of the three bitalgorithm of the above-cited copending application. It should be notedfrom Curve J, FIG. 3 that the conference circuit of this inventionoperates in a subtract phase first and then in an add phase for each bitperiod.

The bits stored for each bit stream from phones A_(I) to F_(I) aresequentially coupled to buses 5-7 by means of the tri-state buffers 8-13under control of timing signals present at the output of inverters 14-19coupled to the O₁ to O₆ outputs of a four-stage Johnson octal counter 20clocked by the 512 KHz clock (Curve B, FIG. 3) coupled through buffer21. The internal states of counter 20 are shown in Curves D to H, FIG. 3and the timing signal of Curve E, FIG. 3 inverted by inverters 14, 16and 18 enables tri-state buffers 8, 10 and 12 in sequence while thetiming signal of Curve D, FIG. 3, inverted by inverters 15, 17 and 19enables tri-state buffers 9, 11 and 13 with the positive pulses of theseinverted timing signals corresponding to the phone times of Curve I,FIG. 3. Buses 5-7 couple the stored CVSD bits when the associatedtri-state buffers are enabled to the three most significant adders bitinputs A₇, A₆ and A₅ of programmable read only memory subtractor 22 andprogrammable read only memory adder 23. Counter 20 operates during boththe add phase and subtract phase and is reset by the frame signal (CurveC, FIG. 3) after being inverted by inverter 24.

Tri-state buffers 8-13 have three output states, logic "1", logic "0"and a high impedance (open). Buffers 8-13 may be integrated circuitmodel 80C97 available from National Semiconductor. Counter 70 may beintegrated circuit model 34022 available from Fairchild. Subtractor 22and adder 23 may be integrated circuits model 1702A available fromIntel.

A latch circuit 25 including five D-type flip flops 26-30 are coupledbetween the five least significant bit outputs O₀ to O₄ of adder 23 andthe five least significant address bit inputs A₀ to A₄ of both adder 23and subtractor 22. Flip flops 26-30 are reset at the start of the addphase to provide a logic "0" at all of the Q outputs by the outputsignal of NAND gate 31 and clocked on the upward transition of theoutput signal of NAND gate 32 which receives one input signal from theoutput of NAND gate 33, a second input from buffer 34 passing the 32 KHzclock and a third input from buffer 21 passing the 512 KHz clock.Circuit 25 provides a running sum of the least significant bits as thephones are sequentially coupled to adder 23 from buses 5-7.

During the subtract phase the bits from the phones which aresequentially coupled to subtractor 22 and the two most significant bitoutputs are coupled after each subtraction to an intermediate sequentialstorage circuit 35 including JK flip flops 36-41 which are clocked onthe falling transition of timing signals from a 4 stage Johnson octalcounter 42. Counter 42 operates like counter 20 only during the subtractphase with the timing signal of Curve D, FIG. 3 clocking flip flops 36,38 and 40 and the timing signal of Curve E, FIG. 3 clocking flip flops37, 39 and 41 with the positive pulses of these timing signalscorresponding to phone times of Curve I, FIG. 3. During the add phase,counter 42 is reset to and held at zero by the 32 KHz clock from buffer34. Counter 42 may be an integrated circuit model 34022 available fromFairchild.

The Q outputs of each of flip-flops 36-41 are connected to a differentone of the D inputs of D-type flip flops 42-47 to provide the desiredCVSD conference bit stream to a different one of each of the phones A toF minus its own intelligence. Flip flops 42-47 are clocked on the risingtransition of the inverted 32 KHz at the output of inverter 48.

Adder 23 and subtractor 22 are each capable of being programmed tocontain 256 rows or words of binary bits with each row or wordcontaining 8 binary bits and, hence, a total capacity of 2048 bits. Theoperation of the conference circuit of the present invention will now bedescribed employing the following sixteen TABLES I to XVI, where TABLESI to VIII illustrate the binary bits programmed into adder 23 for theeight different combinations of bits t, t-1 and t-2 and their associatedassigned slope numbers and TABLES IX to XVI illustrate the binary bitsprogrammed into subtractor 22 for the eight different combinations ofbits t, t-1 and t-2 and their associated assigned slope numbers.

                                      TABLE I                                     __________________________________________________________________________    ASSIGNED SLOPE                                                                NUMBER = -2                                                                   ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.          sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    0 0  0 0  0 0 0 0       0  0 0 1 0                                            0 0  0 0  0 0 0 1       0  0 0 1 1                                            0 0  0 0  0 0 0 1       0  0 0 1 1                                            0 0  0 0  0 0 1 0       0  0 1 0 0                                            0 0  0 0  0 0 1 1       0  0 1 0 1                                            0 0  0 0  0 1 0 0       0  0 1 1 0                                            0 0  0 0  0 1 0 1       0  0 1 1 1                                            0 0  0 0  0 1 1 0       0  1 0 0 0                                            0 0  0 0  0 1 1 1       0  1 0 0 1                                            0 0  0 0  1 0 0 0       0  1 0 1 0                                            0 0  0 0  1 0 0 1       0  1 0 1 1                                            0 0  0 0  1 0 1 0       0  1 1 0 0                                            0 0  0 0  1 0 1 1       0  1 1 0 1                                            0 0  0 0  1 1 0 0       0  1 1 1 0                                            0 0  0 0  1 1 0 1       0  1 1 1 1                                            0 0  0 0  1 1 1 0       0  1 1 1 1                                            0 0  0 0  1 1 1 1       0  1 1 1 1                                            0 0  0 1  0 0 0 0       0  0 0 1 0                                            0 0  0 1  0 0 0 1       0  0 0 0 1                                            0 0  0 1  0 0 1 0       0  0 0 0 0                                            0 0  0 1  0 0 1 1       1  0 0 0 1                                            0 0  0 1  0 1 0 0       1  0 0 1 0                                            0 0  0 1  0 1 0 1       1  0 0 1 1                                            0 0  0 1  0 1 1 0       1  0 1 0 0                                            0 0  0 1  0 1 1 1       1  0 1 0 1                                            0 0  0 1  1 0 0 0       1  0 1 1 0                                            0 0  0 1  1 0 0 1       1  0 1 1 1                                            0 0  0 1  1 0 1 0       1  1 0 0 0                                            0 0  0 1  1 0 1 1       1  1 0 0 1                                            0 0  0 1  1 1 0 0       1  1 0 1 0                                            0 0  0 1  1 1 0 1       1  1 0 1 1                                            0 0  0 1  1 1 1 0       1  1 1 0 0                                            0 0  0 1  1 1 1 1       1  1 1 0 1                                            __________________________________________________________________________

                                      TABLE II                                    __________________________________________________________________________    ASSIGNED SLOPE                                                                NUMBER = -1                                                                   ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.          sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    0 0  1 0  0 0 0 0       0  0 0 0 1                                            0 0  1 0  0 0 0 1       0  0 0 1 0                                            0 0  1 0  0 0 1 0       0  0 0 1 1                                            0 0  1 0  0 0 1 1       0  0 1 0 0                                            0 0  1 0  0 1 0 0       0  0 1 0 1                                            0 0  1 0  0 1 0 1       0  0 1 1 0                                            0 0  1 0  0 1 1 0       0  0 1 1 1                                            0 0  1 0  0 1 1 1       0  1 0 0 0                                            0 0  1 0  1 0 0 0       0  1 0 0 1                                            0 0  1 0  1 0 0 1       0  1 0 1 0                                            0 0  1 0  1 0 1 0       0  1 0 1 1                                            0 0  1 0  1 0 1 1       0  1 1 0 0                                            0 0  1 0  1 1 0 0       0  1 1 0 1                                            0 0  1 0  1 1 0 1       0  1 1 1 0                                            0 0  1 0  1 1 1 0       0  1 1 1 1                                            0 0  1 0  1 1 1 1       0  1 1 1 1                                            0 0  1 1  0 0 0 0       0  0 0 0 1                                            0 0  1 1  0 0 0 1       0  0 0 0 0                                            0 0  1 1  0 0 1 0       1  0 0 0 1                                            0 0  1 1  0 0 1 1       1  0 0 1 0                                            0 0  1 1  0 1 0 0       1  0 0 1 1                                            0 0  1 1  0 1 0 1       1  0 1 0 0                                            0 0  1 1  0 1 1 0       1  0 1 0 1                                            0 0  1 1  0 1 1 1       1  0 1 1 0                                            0 0  1 1  1 0 0 0       1  0 1 1 1                                            0 0  1 1  1 0 0 1       1  1 0 0 0                                            0 0  1 1  1 0 1 0       1  1 0 0 1                                            0 0  1 1  1 0 1 1       1  1 0 1 0                                            0 0  1 1  1 1 0 0       1  1 0 1 1                                            0 0  1 1  1 1 0 1       1  1 1 0 0                                            0 0  1 1  1 1 1 0       1  1 1 0 1                                            0 0  1 1  1 1 1 1       1  1 1 1 0                                            __________________________________________________________________________

                                      TABLE III                                   __________________________________________________________________________    ASSIGNED SLOPE                                                                NUMBER = 0                                                                    ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.          sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    0 1  0 0  0 0 0 0       0  0 0 0 0                                            0 1  0 0  0 0 0 1       0  0 0 0 1                                            0 1  0 0  0 0 1 0       0  0 0 1 0                                            0 1  0 0  0 0 1 1       0  0 0 1 1                                            0 1  0 0  0 1 0 0       0  0 1 0 0                                            0 1  0 0  0 1 0 1       0  0 1 0 1                                            0 1  0 0  0 1 1 0       0  0 1 1 0                                            0 1  0 0  0 1 1 1       0  0 1 1 1                                            0 1  0 0  1 0 0 0       0  1 0 0 0                                            0 1  0 0  1 0 0 1       0  1 0 0 1                                            0 1  0 0  1 0 1 0       0  1 0 1 0                                            0 1  0 0  1 0 1 1       0  1 0 1 1                                            0 1  0 0  1 1 0 0       0  1 1 0 0                                            0 1  0 0  1 1 0 1       0  1 1 0 1                                            0 1  0 0  1 1 1 0       0  1 1 1 0                                            0 1  0 0  1 1 1 1       0  1 1 1 1                                            0 1  0 1  0 0 0 0       0  0 0 0 0                                            0 1  0 1  0 0 0 1       1  0 0 0 1                                            0 1  0 1  0 0 1 0       1  0 0 1 0                                            0 1  0 1  0 0 1 1       1  0 0 1 1                                            0 1  0 1  0 1 0 0       1  0 1 0 0                                            0 1  0 1  0 1 0 1       1  0 1 0 1                                            0 1  0 1  0 1 1 0       1  0 1 1 0                                            0 1  0 1  0 1 1 1       1  0 1 1 1                                            0 1  0 1  1 0 0 0       1  1 0 0 0                                            0 1  0 1  1 0 0 1       1  1 0 0 1                                            0 1  0 1  1 0 1 0       1  1 0 1 0                                            0 1  0 1  1 0 1 1       1  1 0 1 1                                            0 1  0 1  1 1 0 0       1  1 1 0 0                                            0 1  0 1  1 1 0 1       1  1 1 0 1                                            0 1  0 1  1 1 1 0       1  1 1 1 0                                            0 1  0 1  1 1 1 1       1  1 1 1 1                                            __________________________________________________________________________

                                      TABLE IV                                    __________________________________________________________________________    ASSIGNED SLOPE                                                                NUMBER = 0                                                                    ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.          sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    0 1  1 0  0 0 0 0       0  0 0 0 0                                            0 1  1 0  0 0 0 1       0  0 0 0 1                                            0 1  1 0  0 0 1 0       0  0 0 1 0                                            0 1  1 0  0 0 1 1       0  0 0 1 1                                            0 1  1 0  0 1 0 0       0  0 1 0 0                                            0 1  1 0  0 1 0 1       0  0 1 0 1                                            0 1  1 0  0 1 1 0       0  0 1 1 0                                            0 1  1 0  0 1 1 1       0  0 1 1 1                                            0 1  1 0  1 0 0 0       0  1 0 0 0                                            0 1  1 0  1 0 0 1       0  1 0 0 1                                            0 1  1 0  1 0 1 0       0  1 0 1 0                                            0 1  1 0  1 0 1 1       0  1 0 1 1                                            0 1  1 0  1 1 0 0       0  1 1 0 0                                            0 1  1 0  1 1 0 1       0  1 1 0 1                                            0 1  1 0  1 1 1 0       0  1 1 1 0                                            0 1  1 0  1 1 1 1       0  1 1 1 1                                            0 1  1 1  0 0 0 0       0  0 0 0 0                                            0 1  1 1  0 0 0 1       1  0 0 0 1                                            0 1  1 1  0 0 1 0       1  0 0 1 0                                            0 1  1 1  0 0 1 1       1  0 0 1 1                                            0 1  1 1  0 1 0 0       1  0 1 0 0                                            0 1  1 1  0 1 0 1       1  0 1 0 1                                            0 1  1 1  0 1 1 0       1  0 1 1 0                                            0 1  1 1  0 1 1 1       1  0 1 1 1                                            0 1  1 1  1 0 0 0       1  1 0 0 0                                            0 1  1 1  1 0 0 1       1  1 0 0 1                                            0 1  1 1  1 0 1 0       1  1 0 1 0                                            0 1  1 1  1 0 1 1       1  1 0 1 1                                            0 1  1 1  1 1 0 0       1  1 1 0 0                                            0 1  1 1  1 1 0 1       1  1 1 0 1                                            0 1  1 1  1 1 1 0       1  1 1 1 0                                            0 1  1 1  1 1 1 1       1  1 1 1 1                                            __________________________________________________________________________

                                      TABLE V                                     __________________________________________________________________________    ASSIGNED SLOPE                                                                NUMBER = 0                                                                    ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.          sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    1 0  0 0  0 0 0 0       0  0 0 0 0                                            1 0  0 0  0 0 0 1       0  0 0 0 1                                            1 0  0 0  0 0 1 0       0  0 0 1 0                                            1 0  0 0  0 0 1 1       0  0 0 1 1                                            1 0  0 0  0 1 0 0       0  0 1 0 0                                            1 0  0 0  0 1 0 1       0  0 1 0 1                                            1 0  0 0  0 1 1 0       0  0 1 1 0                                            1 0  0 0  0 1 1 1       0  0 1 1 1                                            1 0  0 0  1 0 0 0       0  1 0 0 0                                            1 0  0 0  1 0 0 1       0  1 0 0 1                                            1 0  0 0  1 0 1 0       0  1 0 1 0                                            1 0  0 0  1 0 1 1       0  1 0 1 1                                            1 0  0 0  1 1 0 0       0  1 1 0 0                                            1 0  0 0  1 1 0 1       0  1 1 0 1                                            1 0  0 0  1 1 1 0       0  1 1 1 0                                            1 0  0 0  1 1 1 1       0  1 1 1 1                                            1 0  0 1  0 0 0 0       0  0 0 0 0                                            1 0  0 1  0 0 0 1       1  0 0 0 1                                            1 0  0 1  0 0 1 0       1  0 0 1 0                                            1 0  0 1  0 0 1 1       1  0 0 1 1                                            1 0  0 1  0 1 0 0       1  0 1 0 0                                            1 0  0 1  0 1 0 1       1  0 1 0 1                                            1 0  0 1  0 1 1 0       1  0 1 1 0                                            1 0  0 1  0 1 1 1       1  0 1 1 1                                            1 0  0 1  1 0 0 0       1  1 0 0 0                                            1 0  0 1  1 0 0 1       1  1 0 0 1                                            1 0  0 1  1 0 1 0       1  1 0 1 0                                            1 0  0 1  1 0 1 1       1  1 0 1 1                                            1 0  0 1  1 1 0 0       1  1 1 0 0                                            1 0  0 1  1 1 0 1       1  1 1 0 1                                            1 0  0 1  1 1 1 0       1  1 1 1 0                                            1 0  0 1  1 1 1 1       1  1 1 1 1                                            __________________________________________________________________________

                                      TABLE VI                                    __________________________________________________________________________    ASSIGNED SLOPE                                                                NUMBER = 0                                                                    ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.          sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                           O.sub.0                                      __________________________________________________________________________    1 0  1 0  0 0 0 0       0  0 0 0 0                                            1 0  1 0  0 0 0 1       0  0 0 0 1                                            1 0  1 0  0 0 1 0       0  0 0 1 0                                            1 0  1 0  0 0 1 1       0  0 0 1 1                                            1 0  1 0  0 1 0 0       0  0 1 0 0                                            1 0  1 0  0 1 0 1       0  0 1 0 1                                            1 0  1 0  0 1 1 0       0  0 1 1 0                                            1 0  1 0  0 1 1 1       0  0 1 1 1                                            1 0  1 0  1 0 0 0       0  1 0 0 0                                            1 0  1 0  1 0 0 1       0  1 0 0 1                                            1 0  1 0  1 0 1 0       0  1 0 1 0                                            1 0  1 0  1 0 1 1       0  1 0 1 1                                            1 0  1 0  1 1 0 0       0  1 1 0 0                                            1 0  1 0  1 1 0 1       0  1 1 0 1                                            1 0  1 0  1 1 1 0       0  1 1 1 0                                            1 0  1 0  1 1 1 1       0  1 1 1 1                                            1 0  1 1  0 0 0 0       0  0 0 0 0                                            1 0  1 1  0 0 0 1       1  0 0 0 1                                            1 0  1 1  0 0 1 0       1  0 0 1 0                                            1 0  1 1  0 0 1 1       1  0 0 1 1                                            1 0  1 1  0 1 0 0       1  0 1 0 0                                            1 0  1 1  0 1 0 1       1  0 1 0 1                                            1 0  1 1  0 1 1 0       1  0 1 1 0                                            1 0  1 1  0 1 1 1       1  0 1 1 1                                            1 0  1 1  1 0 0 0       1  1 0 0 0                                            1 0  1 1  1 0 0 1       1  1 0 0 1                                            1 0  1 1  1 0 1 0       1  1 0 1 0                                            1 0  1 1  1 0 1 1       1  1 0 1 1                                            1 0  1 1  1 1 0 0       1  1 1 0 0                                            1 0  1 1  1 1 0 1       1  1 1 0 1                                            1 0  1 1  1 1 1 0       1  1 1 1 0                                            1 0  1 1  1 1 1 1       1  1 1 1 1                                            __________________________________________________________________________

                                      TABLE VII                                   __________________________________________________________________________    ASSIGNED SLOPE                                                                NUMBER = +1                                                                   ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.          sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    1 1  0 0  0 0 0 0       1  0 0 0 1                                            1 1  0 0  0 0 0 1       0  0 0 0 0                                            1 1  0 0  0 0 1 0       0  0 0 0 1                                            1 1  0 0  0 0 1 1       0  0 0 1 0                                            1 1  0 0  0 1 0 0       0  0 0 1 1                                            1 1  0 0  0 1 0 1       0  0 1 0 0                                            1 1  0 0  0 1 1 0       0  0 1 0 1                                            1 1  0 0  0 1 1 1       0  0 1 1 0                                            1 1  0 0  1 0 0 0       0  0 1 1 1                                            1 1  0 0  1 0 0 1       0  1 0 0 0                                            1 1  0 0  1 0 1 0       0  1 0 0 1                                            1 1  0 0  1 0 1 1       0  1 0 1 0                                            1 1  0 0  1 1 0 0       0  1 0 1 1                                            1 1  0 0  1 1 0 1       0  1 1 0 0                                            1 1  0 0  1 1 1 0       0  1 1 0 1                                            1 1  0 0  1 1 1 1       0  1 1 1 0                                            1 1  0 1  0 0 0 0       1  0 0 0 1                                            1 1  0 1  0 0 0 1       1  0 0 1 0                                            1 1  0 1  0 0 1 0       1  0 0 1 1                                            1 1  0 1  0 0 1 1       1  0 1 0 0                                            1 1  0 1  0 1 0 0       1  0 1 0 1                                            1 1  0 1  0 1 0 1       1  0 1 1 0                                            1 1  0 1  0 1 1 0       1  0 1 1 1                                            1 1  0 1  0 1 1 1       1  1 0 0 0                                            1 1  0 1  1 0 0 0       1  1 0 0 1                                            1 1  0 1  1 0 0 1       1  1 0 1 0                                            1 1  0 1  1 0 1 0       1  1 0 1 1                                            1 1  0 1  1 0 1 1       1  1 1 0 0                                            1 1  0 1  1 1 0 0       1  1 1 0 1                                            1 1  0 1  1 1 0 1       1  1 1 1 0                                            1 1  0 1  1 1 1 0       1  1 1 1 1                                            1 1  0 1  1 1 1 1       1  1 1 1 1                                            __________________________________________________________________________

                                      TABLE VIII                                  __________________________________________________________________________    ASSIGNED SLOPE                                                                NUMBER = +2                                                                   ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.          sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    1 1  1 0  0 0 0 0       1  0 0 1 0                                            1 1  1 0  0 0 0 1       1  0 0 0 1                                            1 1  1 0  0 0 1 0       0  0 0 0 0                                            1 1  1 0  0 0 1 1       0  0 0 0 1                                            1 1  1 0  0 1 0 0       0  0 0 1 0                                            1 1  1 0  0 1 0 1       0  0 0 1 1                                            1 1  1 0  0 1 1 0       0  0 1 0 0                                            1 1  1 0  0 1 1 1       0  0 1 0 1                                            1 1  1 0  1 0 0 0       0  0 1 1 0                                            1 1  1 0  1 0 0 1       0  0 1 1 1                                            1 1  1 0  1 0 1 0       0  1 0 0 0                                            1 1  1 0  1 0 1 1       0  1 0 0 1                                            1 1  1 0  1 1 0 0       0  1 0 1 0                                            1 1  1 0  1 1 0 1       0  1 0 1 1                                            1 1  1 0  1 1 1 0       0  1 1 0 0                                            1 1  1 0  1 1 1 1       0  1 1 0 1                                            1 1  1 1  0 0 0 0       1  0 0 1 0                                            1 1  1 1  0 0 0 1 1     1  0 0 1 1                                            1 1  1 1  0 0 1 0       1  0 1 0 0                                            1 1  1 1  0 0 1 1       1  0 1 0 1                                            1 1  1 1  0 1 0 0       1  0 1 1 0                                            1 1  1 1  0 1 0 1       1  0 1 1 1                                            1 1  1 1  0 1 1 0       1  1 0 0 0                                            1 1  1 1  0 1 1 1       1  1 0 0 1                                            1 1  1 1  1 0 0 0       1  1 0 1 0                                            1 1  1 1  1 0 0 1       1  1 0 1 1                                            1 1  1 1  1 0 1 0       1  1 1 0 0                                            1 1  1 1  1 0 1 1       1  1 1 0 1                                            1 1  1 1  1 1 0 0       1  1 1 1 0                                            1 1  1 1  1 1 0 1       1  1 1 1 1                                            1 1  1 1  1 1 1 0       1  1 1 1 1                                            1 1  1 1  1 1 1 1       1  1 1 1 1                                            __________________________________________________________________________

                                      TABLE IX                                    __________________________________________________________________________     ASSIGNED SLOPE                                                               NUMBER = -2                                                                   ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.    J K   sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    0 0  0 0  0 0 0 0 1 0 0 1  0 0 1 0                                            0 0  0 0  0 0 0 1 1 0 0 1  0 0 0 1                                            0 0  0 0  0 0 1 0 1 1 0 0  0 0 0 0                                            0 0  0 0  0 0 1 1 0 1 0 0  0 0 0 1                                            0 0  0 0  0 1 0 0 0 1 0 0  0 0 1 0                                            0 0  0 0  0 1 0 1 0 1 0 0  0 0 1 1                                            0 0  0 0  0 1 1 0 0 1 0 0  0 1 0 0                                            0 0  0 0  0 1 1 1 0 1 0 0  0 1 0 1                                            0 0  0 0  1 0 0 0 0 1 0 0  0 1 1 0                                            0 0  0 0  1 0 0 1 0 1 0 0  0 1 1 1                                            0 0  0 0  1 0 1 0 0 1 0 0  1 0 0 0                                            0 0  0 0  1 0 1 1 0 1 0 0  1 0 0 1                                            0 0  0 0  1 1 0 0 0 1 0 0  1 0 1 0                                            0 0  0 0  1 1 0 1 0 1 0 0  1 0 1 1                                            0 0  0 0  1 1 1 0 0 1 0 0  1 1 0 0                                            0 0  0 0  1 1 1 1 0 1 0 0  1 1 0 1                                            0 0  0 1  0 0 0 0 1 0 0 1  0 0 1 0                                            0 0  0 1  0 0 0 1 1 0 0 1  0 0 1 1                                            0 0  0 1  0 0 1 0 1 0 0 1  0 1 0 0                                            0 0  0 1  0 0 1 1 1 0 0 1  0 1 0 1                                            0 0  0 1  0 1 0 0 1 0 0 1  0 1 1 0                                            0 0  0 1  0 1 0 1 1 0 0 1  0 1 1 1                                            0 0  0 1  0 1 1 0 1 0 0 1  1 0 0 0                                            0 0  0 1  0 1 1 1 1 0 0 1  1 0 0 1                                            0 0  0 1  1 0 0 0 1 0 0 1  1 0 1 0                                            0 0  0 1  1 0 0 1 1 0 0 1  1 0 1 1                                            0 0  0 1  1 0 1 0 1 0 0 1  1 1 0 0                                            0 0  0 1  1 0 1 1 1 0 0 1  1 1 0 1                                            0 0  0 1  1 1 0 0 1 0 0 1  1 1 1 0                                            0 0  0 1  1 1 0 1 1 0 0 1  1 1 1 1                                            0 0  0 1  1 1 1 0 1 0 0 1  1 1 1 1                                            0 0  0 1  1 1 1 1 1 0 0 1  1 1 1 1                                            __________________________________________________________________________

                                      TABLE X                                     __________________________________________________________________________    ASSIGNED SLOPE                                                                 NUMBER = -1                                                                  ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.    J K   sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    0 0  1 0  0 0 0 0 1 0 0 1  0 0 0 1                                            0 0  1 0  0 0 0 1 1 1 0 0  0 0 0 0                                            0 0  1 0  0 0 1 0 0 1 0 0  0 0 0 1                                            0 0  1 0  0 0 1 1 0 1 0 0  0 0 1 0                                            0 0  1 0  0 1 0 0 0 1 0 0  0 0 1 1                                            0 0  1 0  0 1 0 1 0 1 0 0  0 1 0 0                                            0 0  1 0  0 1 1 0 0 1 0 0  0 1 0 1                                            0 0  1 0  0 1 1 1 0 1 0 0  0 1 1 0                                            0 0  1 0  1 0 0 0 0 1 0 0  0 1 1 1                                            0 0  1 0  1 0 0 1 0 1 0 0  1 0 0 0                                            0 0  1 0  1 0 1 0 0 1 0 0  1 0 0 1                                            0 0  1 0  1 0 1 1 0 1 0 0  1 0 1 0                                            0 0  1 0  1 1 0 0 0 1 0 0  1 0 1 1                                            0 0  1 0  1 1 0 1 0 1 0 0  1 1 0 0                                            0 0  1 0  1 1 1 0 0 1 0 0  1 1 0 1                                            0 0  1 0  1 1 1 1 0 1 0 0  1 1 1 0                                            0 0  1 1  0 0 0 0 1 0 0 1  0 0 0 1                                            0 0  1 1  0 0 0 1 1 0 0 1  0 0 1 0                                            0 0  1 1  0 0 1 0 1 0 0 1  0 0 1 1                                            0 0  1 1  0 0 1 1 1 0 0 1  0 1 0 0                                            0 0  1 1  0 1 0 0 1 0 0 1  0 1 0 1                                            0 0  1 1  0 1 0 1 1 0 0 1  0 1 1 0                                            0 0  1 1  0 1 1 0 1 0 0 1  0 1 1 1                                            0 0  1 1  0 1 1 1 1 0 0 1  1 0 0 0                                            0 0  1 1  1 0 0 0 1 0 0 1  1 0 0 1                                            0 0  1 1  1 0 0 1 1 0 0 1  1 0 1 0                                            0 0  1 1  1 0 1 0 1 0 0 1  1 0 1 1                                            0 0  1 1  1 0 1 1 1 0 0 1  1 1 0 0                                            0 0  1 1  1 1 0 0 1 0 0 1  1 1 0 1                                            0 0  1 1  1 1 0 1 1 0 0 1  1 1 1 0                                            0 0  1 1  1 1 1 0 1 0 0 1  1 1 1 1                                            0 0  1 1  1 1 1 1 1 0 0 1  1 1 1 1                                            __________________________________________________________________________

                                      TABLE XI                                    __________________________________________________________________________    ASSIGNED SLOPE                                                                NUMBER = 0                                                                    ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sing                                                                             MAG.    J K   sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    0 1  0 0  0 0 0 0 1 1 0 0  0 0 0 0                                            0 1  0 0  0 0 0 1 0 1 0 0  0 0 0 1                                            0 1  0 0  0 0 1 0 0 1 0 0  0 0 1 0                                            0 1  0 0  0 0 1 1 0 1 0 0  0 0 1 1                                            0 1  0 0  0 1 0 0 0 1 0 0  0 1 0 0                                            0 1  0 0  0 1 0 1 0 1 0 0  0 1 0 1                                            0 1  0 0  0 1 1 0 0 1 0 0  0 1 1 0                                            0 1  0 0  0 1 1 1 0 1 0 0  0 1 1 1                                            0 1  0 0  1 0 0 0 0 1 0 0  1 0 0 0                                            0 1  0 0  1 0 0 1 0 1 0 0  1 0 0 1                                            0 1  0 0  1 0 1 0 0 1 0 0  1 0 1 0                                            0 1  0 0  1 0 1 1 0 1 0 0  1 0 1 1                                            0 1  0 0  1 1 0 0 0 1 0 0  1 1 0 0                                            0 1  0 0  1 1 0 1 0 1 0 0  1 1 0 1                                            0 1  0 0  1 1 1 0 0 1 0 0  1 1 1 0                                            0 1  0 0  1 1 1 1 0 1 0 0  1 1 1 1                                            0 1  0 1  0 0 0 0 1 1 0 0  0 0 0 0                                            0 1  0 1  0 0 0 1 1 0 0 1  0 0 0 1                                            0 1  0 1  0 0 1 0 1 0 0 1  0 0 1 0                                            0 1  0 1  0 0 1 1 1 0 0 1  0 0 1 1                                            0 1  0 1  0 1 0 0 1 0 0 1  0 1 0 0                                            0 1  0 1  0 1 0 1 1 0 0 1  0 1 0 1                                            0 1  0 1  0 1 1 0 1 0 0 1  0 1 1 0                                            0 1  0 1  0 1 1 1 1 0 0 1  0 1 1 1                                            0 1  0 1  1 0 0 0 1 0 0 1  1 0 0 0                                            0 1  0 1  1 0 0 1 1 0 0 1  1 0 0 1                                            0 1  0 1  1 0 1 0 1 0 0 1  1 0 1 0                                            0 1  0 1  1 0 1 1 1 0 0 1  1 0 1 1                                            0 1  0 1  1 1 0 0 1 0 0 1  1 1 0 0                                            0 1  0 1  1 1 0 1 1 0 0 1  1 1 0 1                                            0 1  0 1  1 1 1 0 1 0 0 1  1 1 1 0                                            0 1  0 1  1 1 1 1 1 0 0 1  1 1 1 1                                            __________________________________________________________________________

                                      TABLE XII                                   __________________________________________________________________________     ASSIGNED SLOPE                                                               NUMBER = 0                                                                    ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.    J K   sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    0 1  1 0  0 0 0 0 1 1 0 0  0 0 0 0                                            0 1  1 0  0 0 0 1 0 1 0 0  0 0 0 1                                            0 1  1 0  0 0 1 0 0 1 0 0  0 0 1 0                                            0 1  1 0  0 0 1 1 0 1 0 0  0 0 1 1                                            0 1  1 0  0 1 0 0 0 1 0 0  0 1 0 0                                            0 1  1 0  0 1 0 1 0 1 0 0  0 1 0 1                                            0 1  1 0  0 1 1 0 0 1 0 0  0 1 1 0                                            0 1  1 0  0 1 1 1 0 1 0 0  0 1 1 1                                            0 1  1 0  1 0 0 0 0 1 0 0  1 0 0 0                                            0 1  1 0  1 0 0 1 0 1 0 0  1 0 0 1                                            0 1  1 0  1 0 1 0 0 1 0 0  1 0 1 0                                            0 1  1 0  1 0 1 1 0 1 0 0  1 0 1 1                                            0 1  1 0  1 1 0 0 0 1 0 0  1 1 0 0                                            0 1  1 0  1 1 0 1 0 1 0 0  1 1 0 1                                            0 1  1 0  1 1 1 0 0 1 0 0  1 1 1 0                                            0 1  1 0  1 1 1 1 0 1 0 0  1 1 1 1                                            0 1  1 1  0 0 0 0 1 1 0 0  0 0 0 0                                            0 1  1 1  0 0 0 1 1 0 0 1  0 0 0 1                                            0 1  1 1  0 0 1 0 1 0 0 1  0 0 1 0                                            0 1  1 1  0 0 1 1 1 0 0 1  0 0 1 1                                            0 1  1 1  0 1 0 0 1 0 0 1  0 1 0 0                                            0 1  1 1  0 1 0 1 1 0 0 1  0 1 0 1                                            0 1  1 1  0 1 1 0 1 0 0 1  0 1 1 0                                            0 1  1 1  0 1 1 1 1 0 0 1  0 1 1 1                                            0 1  1 1  1 0 0 0 1 0 0 1  1 0 0 0                                            0 1  1 1  1 0 0 1 1 0 0 1  1 0 0 1                                            0 1  1 1  1 0 1 0 1 0 0 1  1 0 1 0                                            0 1  1 1  1 0 1 1 1 0 0 1  1 0 1 1                                            0 1  1 1  1 1 0 0 1 0 0 1  1 1 0 0                                            0 1  1 1  1 1 0 1 1 0 0 1  1 1 0 1                                            0 1  1 1  1 1 1 0 1 0 0 1  1 1 1 0                                            0 1  1 1  1 1 1 1 1 0 0 1  1 1 1 1                                            __________________________________________________________________________

                                      TABLE XIII                                  __________________________________________________________________________    ASSIGNED SLOPE                                                                NUMBER = 0                                                                    ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.    J K   sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    1 0  0 0  0 0 0 0 1 1 0 0  0 0 0 0                                            1 0  0 0  0 0 0 1 0 1 0 0  0 0 0 1                                            1 0  0 0  0 0 1 0 0 1 0 0  0 0 1 0                                            1 0  0 0  0 0 1 1 0 1 0 0  0 0 1 1                                            1 0  0 0  0 1 0 0 0 1 0 0  0 1 0 0                                            1 0  0 0  0 1 0 1 0 1 0 0  0 1 0 1                                            1 0  0 0  0 1 1 0 0 1 0 0  0 1 1 0                                            1 0  0 0  0 1 1 1 0 1 0 0  0 1 1 1                                            1 0  0 0  1 0 0 0 0 1 0 0  1 0 0 0                                            1 0  0 0  1 0 0 1 0 1 0 0  1 0 0 1                                            1 0  0 0  1 0 1 0 0 1 0 0  1 0 1 0                                            1 0  0 0  1 0 1 1 0 1 0 0  1 0 1 1                                            1 0  0 0  1 1 0 0 0 1 0 0  1 1 0 0                                            1 0  0 0  1 1 0 1 0 1 0 0  1 1 0 1                                            1 0  0 0  1 1 1 0 0 1 0 0  1 1 1 0                                            1 0  0 0  1 1 1 1 0 1 0 0  1 1 1 1                                            1 0  0 1  0 0 0 0 1 1 0 0  0 0 0 0                                            1 0  0 1  0 0 0 1 1 0 0 1  0 0 0 1                                            1 0  0 1  0 0 1 0 1 0 0 1  0 0 1 0                                            1 0  0 1  0 0 1 1 1 0 0 1  0 0 1 1                                            1 0  0 1  0 1 0 0 1 0 0 1  0 1 0 0                                            1 0  0 1  0 1 0 1 1 0 0 1  0 1 0 1                                            1 0  0 1  0 1 1 0 1 0 0 1  0 1 1 0                                            1 0  0 1  0 1 1 1 1 0 0 1  0 1 1 1                                            1 0  0 1  1 0 0 0 1 0 0 1  1 0 0 0                                            1 0  0 1  1 0 0 1 1 0 0 1  1 0 0 1                                            1 0  0 1  1 0 1 0 1 0 0 1  1 0 1 0                                            1 0  0 1  1 0 1 1 1 0 0 1  1 0 1 1                                            1 0  0 1  1 1 0 0 1 0 0 1  1 1 0 0                                            1 0  0 1  1 1 0 1 1 0 0 1  1 1 0 1                                            1 0  0 1  1 1 1 0 1 0 0 1  1 1 1 0                                            1 0  0 1  1 1 1 1 1 0 0 1  1 1 1 1                                            __________________________________________________________________________

                                      TABLE XIV                                   __________________________________________________________________________    ASSIGNED SLOPE                                                                NUMBER = 0                                                                    ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.    J K   sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O                                            __________________________________________________________________________    1 0  1 0  0 0 0 0 1 1 0 0  0 0 0 0                                            1 0  1 0  0 0 0 1 0 1 0 0  0 0 0 1                                            1 0  1 0  0 0 1 0 0 1 0 0  0 0 1 0                                            1 0  1 0  0 0 1 1 0 1 0 0  0 0 1 1                                            1 0  1 0  0 1 0 0 0 1 0 0  0 1 0 0                                            1 0  1 0  0 1 0 1 0 1 0 0  0 1 0 1                                            1 0  1 0  0 1 1 0 0 1 0 0  0 1 1 0                                            1 0  1 0  0 1 1 1 0 1 0 0  0 1 1 1                                            1 0  1 0  1 0 0 0 0 1 0 0  1 0 0 0                                            1 0  1 0  1 0 0 1 0 1 0 0  1 0 0 1                                            1 0  1 0  1 0 1 0 0 1 0 0  1 0 1 0                                            1 0  1 0  1 0 1 1 0 1 0 0  1 0 1 1                                            1 0  1 0  1 1 0 0 0 1 0 0  1 1 0 0                                            1 0  1 0  1 1 0 1 0 1 0 0  1 1 0 1                                            1 0  1 0  1 1 1 0 0 1 0 0  1 1 1 0                                            1 0  1 0  1 1 1 1 0 1 0 0  1 1 1 1                                            1 0  1 1  0 0 0 0 1 1 0 0  0 0 0 0                                            1 0  1 1  0 0 0 1 1 0 0 1  0 0 0 1                                            1 0  1 1  0 0 1 0 1 0 0 1  0 0 1 0                                            1 0  1 1  0 0 1 1 1 0 0 1  0 0 1 1                                            1 0  1 1  0 1 0 0 1 0 0 1  0 1 0 0                                            1 0  1 1  0 1 0 1 1 0 0 1  0 1 0 1                                            1 0  1 1  0 1 1 0 1 0 0 1  0 1 1 0                                            1 0  1 1  0 1 1 1 1 0 0 1  0 1 1 1                                            1 0  1 1  1 0 0 0 1 0 0 1  1 0 0 0                                            1 0  1 1  1 0 0 1 1 0 0 1  1 0 0 1                                            1 0  1 1  1 0 1 0 1 0 0 1  1 0 1 0                                            1 0  1 1  1 0 1 1 1 0 0 1  1 0 1 1                                            1 0  1 1  1 1 0 0 1 0 0 1  1 1 0 0                                            1 0  1 1  1 1 0 1 1 0 0 1  1 1 0 1                                            1 0  1 1  1 1 1 0 1 0 0 1  1 1 1 0                                            1 0  1 1  1 1 1 1 1 0 0 1  1 1 1 1                                            __________________________________________________________________________

                                      TABLE XV                                    __________________________________________________________________________    ASSIGNED SLOPE                                                                NUMBER = +1                                                                   ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.    J K   sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    1 1  0 0  0 0 0 0 0 1 0 0  0 0 0 1                                            1 1  0 0  0 0 0 1 0 1 0 0  0 0 1 0                                            1 1  0 0  0 0 1 0 0 1 0 0  0 0 1 1                                            1 1  0 0  0 0 1 1 0 1 0 0  0 1 0 0                                            1 1  0 0  0 1 0 0 0 1 0 0  0 1 0 1                                            1 1  0 0  0 1 0 1 0 1 0 0  0 1 1 0                                            1 1  0 0  0 1 1 0 0 1 0 0  0 1 1 1                                            1 1  0 0  0 1 1 1 0 1 0 0  1 0 0 0                                            1 1  0 0  1 0 0 0 0 1 0 0  1 0 0 1                                            1 1  0 0  1 0 0 1 0 1 0 0  1 0 1 0                                            1 1  0 0  1 0 1 0 0 1 0 0  1 0 1 1                                            1 1  0 0  1 0 1 1 0 1 0 0  1 1 0 0                                            1 1  0 0  1 1 0 0 0 1 0 0  1 1 0 1                                            1 1  0 0  1 1 0 1 0 1 0 0  1 1 1 0                                            1 1  0 0  1 1 1 0 0 1 0 0  1 1 1 1                                            1 1  0 0  1 1 1 1 0 1 0 0  1 1 1 1                                            1 1  0 1  0 0 0 0 0 1 0 0  0 0 0 1                                            1 1  0 1  0 0 0 1 1 1 0 0  0 0 0 0                                            1 1  0 1  0 0 1 0 1 0 0 1  0 0 0 1                                            1 1  0 1  0 0 1 1 1 0 0 1  0 0 1 0                                            1 1  0 1  0 1 0 0 1 0 0 1  0 0 1 1                                            1 1  0 1  0 1 0 1 1 0 0 1  0 1 0 0                                            1 1  0 1  0 1 1 0 1 0 0 1  0 1 0 1                                            1 1  0 1  0 1 1 1 1 0 0 1  0 1 1 0                                            1 1  0 1  1 0 0 0 1 0 0 1  0 1 1 1                                            1 1  0 1  1 0 0 1 1 0 0 1  1 0 0 0                                            1 1  0 1  1 0 1 0 1 0 0 1  1 0 0 1                                            1 1  0 1  1 0 1 1 1 0 0 1  1 0 1 0                                            1 1  0 1  1 1 0 0 1 0 0 1  1 0 1 1                                            1 1  0 1  1 1 0 1 1 0 0 1  1 1 0 0                                            1 1  0 1  1 1 1 0 1 0 0 1  1 1 0 1                                            1 1  0 1  1 1 1 1 1 0 0 1  1 1 1 0                                            __________________________________________________________________________

                                      TABLE XVI                                   __________________________________________________________________________    ASSIGNED SLOPE                                                                NUMBER = +2                                                                   ADDRESS           DATA                                                        t t-1                                                                              t-2                                                                             sign                                                                             MAG.    J K   sign                                                                             MAG.                                               A.sub.7                                                                         A.sub.6                                                                          A.sub.5                                                                         A.sub.4                                                                          A.sub.3                                                                         A.sub.2                                                                         A.sub.1                                                                         A.sub.0                                                                         O.sub.7                                                                         O.sub.6                                                                         O.sub.5                                                                         O.sub.4                                                                          O.sub.3                                                                         O.sub.2                                                                         O.sub.1                                                                         O.sub.0                                      __________________________________________________________________________    1 1  1 0  0 0 0 0 0 1 0 0  0 0 1 0                                            1 1  1 0  0 0 0 1 0 1 0 0  0 0 1 1                                            1 1  1 0  0 0 1 0 0 1 0 0  0 1 0 0                                            1 1  1 0  0 0 1 1 0 1 0 0  0 1 0 1                                            1 1  1 0  0 1 0 0 0 1 0 0  0 1 1 0                                            1 1  1 0  0 1 0 1 0 1 0 0  0 1 1 1                                            1 1  1 0  0 1 1 0 0 1 0 0  1 0 0 0                                            1 1  1 0  0 1 1 1 0 1 0 0  1 0 0 1                                            1 1  1 0  1 0 0 0 0 1 0 0  1 0 1 0                                            1 1  1 0  1 0 0 1 0 1 0 0  1 0 1 1                                            1 1  1 0  1 0 1 0 0 1 0 0  1 1 0 0                                            1 1  1 0  1 0 1 1 0 1 0 0  1 1 0 1                                            1 1  1 0  1 1 0 0 0 1 0 0  1 1 1 0                                            1 1  1 0  1 1 0 1 0 1 0 0  1 1 1 1                                            1 1  1 0  1 1 1 0 0 1 0 0  1 1 1 1                                            1 1  1 0  1 1 1 1 0 1 0 0  1 1 1 1                                            1 1  1 1  0 0 0 0 0 1 0 0  0 0 1 0                                            1 1  1 1  0 0 0 1 0 1 0 0  0 0 0 1                                            1 1  1 1  0 0 1 0 1 1 0 0  0 0 0 0                                            1 1  1 1  0 0 1 1 1 0 0 1  0 0 0 1                                            1 1  1 1  0 1 0 0 1 0 0 1  0 0 1 0                                            1 1  1 1  0 1 0 1 1 0 0 1  0 0 1 1                                            1 1  1 1  0 1 1 0 1 0 0 1  0 1 0 0                                            1 1  1 1  0 1 1 1 1 0 0 1  0 1 0 1                                            1 1  1 1  1 0 0 0 1 0 0 1  0 1 1 0                                            1 1  1 1  0 0 1 1 0 0 1 0  1 1 1                                              1 1  1 1  1 0 1 0 1 0 1 1  0 0 0                                              1 1  1 1  1 0 1 1 1 0 0 1  1 0 0 1                                            1 1  1 1  1 1 0 0 1 0 0 1  0 1 0                                              1 1  1 1  1 1 0 1 1 0 0 1  1 0 1 1                                            1 1  1 1  1 1 1 0 1 0 0 1  1 1 0 0                                            1 1  1 1  1 1 1 1 1 0 0 1  1 1 0 1                                            __________________________________________________________________________

In the above TABLES (sign=1=+) and (sign=0=-). As previously stated atthe start of the add phase latch circuit 25 is reset and stores thereinall zeros. Now assume that phone A provides bits t, t-1 and t-2 equal to000. This CVSD bit combination has an assigned slope number of -2 formemory 23 as shown in TABLE I. Since circuit 25 has all zeros therein wego to memory adder 23 as indicated at row 49 of TABLE I and the answeror data is 00010, which is sent to circuit 25. Now assume that phone Bprovides bits t, t-1 and t-2 equal to 001. This CVSD bit combination hasan assigned slope number of -1 as shown in TABLE II. Since circuit 25has the combination 00010 stored therein we go to memory adder 23 asindicated at row 50 of TABLE II and the answer or data is 00011 which issent to circuit 25. As far as the slope number is concerned theoperation (-2)+(-1)=-3 has been performed. Now assume that phone Cprovides bits t, t-1 and t-2 equal to 010. This CVSD bit combination hasan assigned slope number of 0 as shown in TABLE III. Since circuit 25has the combination 00011 stored therein we go to memory adder 23 asindicated at row 51 of TABLE III and the answer or data is still 00011which is sent to circuit 25. Now assume that phone D provides bits t,t-1 and t-2 equal to 101. This CVSD bit combination has an assignedslope number of 0 as shown in TABLE VI. Since circuit 25 has thecombination 00011 stored therein we go to memory adder 23 as indicatedat row 52 of TABLE VI and the answer or data is still 00011 which issent to circuit 25. Now assume that phone E provides bits t, t-1 and t-2equal to 110. This CVSD bit combination has an assigned slope number of+1 as shown in TABLE VII. Since circuit 25 has the combination 00011stored therein we go to memory adder 23 as indicated at row 53 of TABLEVII and the answer or data is 00010 which is sent to circuit 25. Nowassume that phone F provides bits t, t-1 and t-2 equal to 111. This CVSDbit combination has an assigned slope number of +2 as shown in TABLEVIII. Since circuit 25 has the combination 00010 stored therein we go tomemory adder 23 as indicated at row 54 of TABLE VIII and the answer ordata is 00000 which is sent to circuit 25. As far as the slope number isconcerned the total operation performed is(-2)+(-1)+(0)+(0)+(+1)+(+2)=0. It should be noted that the bits t, t-1and t-2 may have combinations different than the ones assumed above, butthe same procedure is followed, namely, the bit combinations present incircuit 25 tells what row of a particular assigned slope number memorytable to enter for the slope number of the next phone entering bits frombuses 5-7 to memory adder 23 and the next sum entered in circuit 25 isfound on that row entered under the data columns.

The subtraction procedure is similar. At the end of the add phase,circuit 25 for the above assumed condition had the total combination00000 stored therein and will remain as such through the subtract phase.Now assume that phone A provides bit t, t-1 and t-2 equal to 000. ThisCVSD bit combination has an assigned slope number of -2 as shown inTABLE IX. Since circuit 25 has the combination 00000 stored therein wego to memory subtractor 22 as indicated at row 55 of TABLE IX and theanswer or data is 10010010. The five least significant bits 10010 merelyrepresent the sign and magnitude of the result. Since as shown in FIG.2, the only portion of the answer or data employed are the two mostsignificant bits O₇ and O₆ which are found under the J and K columns.Thus, with the two most significant numbers being 10 the JK-type flipflop 36 is forced to provide a logic "1" output. Now assume that phone Bprovides bit t, t - 1 and t-2 equal to 001. This CVSD bit combinationhas an assigned slope number of -1 as shown in TABLE X. Since thecombination 00000 is still the total sum, residing in circuit 25, we goto memory subtractor 22 as indicated at row 56 of TABLE X and the answeror data is 10010001 with the five least significant bits 10001representing only the present subtraction result. Looking at the twomost significant bits we have the bit combination 10 which forces theJK-type flip flop 37 to provide a logic "1" output. As far as theassigned slope numbers are concerned the subtraction operations justperformed are (0)-(-2)=+2 and (0)-(-1)=+1. This process will continuefor the remainder of the phones during the subtract phase with the TABLEbeing employed corresponding to the assigned slope number determined bythe combination of the CVSD bits t, t-1 and t-2 with entrance to thememory subtractor 22 TABLE being determined by the five leastsignificant bits as stored in circuit 25 at the end of the add phase. Itshould be noted that the combination 10 of the two most significant bitswould force any flip flop 36-41 to provide a logic "1" output while thecombination 01 of the two most significant bits would force any flipflop 36-41 to provide a logic "0" output and that the associated D-typeflip flops 42-47 are clocked at once at the bit interval to provide thesame CVSD logic output as their associated flip flops 36-41. If thecombination of the two most significant bits is 11, then any JK-flipflop 36-41 will toggle, that is, the output of the flip flop will changeits state during its subtraction period.

While I have described above the principles of my invention inconnection with specific apparatus it is to be clearly understood thatthis description is made only by way of example and not as a limitationto the scope of my invention as set forth in the objects thereof and inthe accompanying claims.

I claim:
 1. An all digital delta modulation telephone conference circuitcomprising:first digital means to separately store in succession aplurality of sequential bits in each of a plurality of input deltamodulation bit streams each originating from a different one of aplurality of phones, each of said plurality of bits being capable ofhaving a plurality of different bit combinations, each of said pluralityof different bit combinations being assigned a predetermined slopenumber, wherein said slope number indicates slope information of ananalog signal represented by each of said plurality of streams; andsecond digital means coupled to said first means for sequentiallyreceiving each of said plurality of bits, for adding from each bitstream correspondingly-occurring first binary bit combinationsdetermined by said slope number assigned to each of said receivedplurality of bits to produce a sum digital signal including informationfrom each of said phones, and for subtracting second binary bitcombinations determined by said slope number assigned to each of saidreceived plurality of bits from said sum digital signal to produce aplurality of output conference delta modulation bit streams each for adifferent one of said plurality of phones and each including informationfrom all of said plurality of phones minus information from theassociated one of said plurality of phones.
 2. A circuit according toclaim 1, whereinsaid second means first performs said adding and thenperforms said subtracting.
 3. A circuit according to claim 2,whereinsaid first means includesa given number of a plurality of cascadeconnected input storage circuits, said given number being equal innumber to said plurality of phones and each of said plurality of storagecircuits is coupled to a different one of said plurality of phones.
 4. Acircuit according to claim 3, whereineach of said plurality of inputstorage devices is a flip flop.
 5. A circuit according to claim 4,whereineach of said flip flops is a D-type flip flop.
 6. A circuitaccording to claim 5, whereinsaid given number is six.
 7. A circuitaccording to claim 2, whereinsaid plurality of phones number six.
 8. Acircuit according to claim 6, whereinsaid second means includesaprogrammable read only memory adder programmed with said first binarybit combinations to enable addition of said first binary bitcombinations determined by said slope number, and a latch circuitcoupled to a predetermined number of outputs of said adder and apredetermined number of address inputs to store a running sum of saidaddition.
 9. A circuit according to claim 8, whereinsaid second meansfurther includesa programmable read only memory subtractor programmedwith said second binary bit combinations to enable subtraction of saidsecond binary bit combinations from the total sum stored in said latchcircuit.
 10. A circuit according to claim 9, whereinsaid latch circuitincludesa predetermined number of flip flops.
 11. A circuit according toclaim 10, whereineach of said flip flops is a D-type flip flop.
 12. Acircuit according to claim 11, whereinsaid predetermined number ofoutputs are the five least significant outputs, and said predeterminednumber of address inputs are the five least significant address inputs.13. A circuit according to claim 12, whereinsaid latch circuit iscoupled to the five least significant address inputs of said subtractor.14. A circuit according to claim 13, whereinsaid second means furtherincludesa tri-state buffer coupled to each of said plurality of inputstorage devices and a given number of address inputs of said adder andsaid subtractor, and a first source of timing signals to sequentiallyenable groups of said buffers to couple each of said plurality of bitsin sequence to said given number of address inputs when said secondmeans is adding and subtracting.
 15. A circuit according to claim 14,whereinsaid given number of address inputs are the three mostsignificant address inputs.
 16. A circuit according to claim 15,whereinsaid second means further includesan intermediate sequentialstorage circuit coupled to the two most significant outputs of saidsubtractor to store sequentially in said intermediate storage circuitthe result of subtraction in said subtractor, and a second source oftiming signals to sequentially control said intermediate storage circuitwhen adding.
 17. A circuit according to claim 16, whereinsaidintermediate storage circuit includesa plurality of flip flops equal innumber to said plurality of phones.
 18. A circuit according to claim 17,whereineach of said flip flops is a JK-type flip flop.
 19. A circuitaccording to claim 18, whereineach of said first and second source oftiming signals includea four-stage Johnson octal counter.
 20. A circuitaccording to claim 19, whereinsaid second means further includesaplurality of output storage circuits equal in number to said pluralityof phones, each of said output storage circuits being coupled to adifferent of said flip flops of said intermediate storage circuit, eachof said output storage circuit providing a different one of saidplurality of conference bit streams.
 21. A circuit according to claim20, whereineach of said plurality of output storage circuits includeaflip flop.
 22. A circuit according to claim 21, whereineach of said flipflops is a D-type flip flop.
 23. A circuit according to claim 2,whereinsaid second means includesa programmable read only memory adderprogrammed with said first binary bit combinations to enable addition ofsaid first binary bit combinations determined by said slope number, anda latch circuit coupled to a predetermined number of outputs of saidadder and a predetermined number of address inputs to store a runningsum of said addition.
 24. A circuit according to claim 23, whereinsaidsecond means further includesa programmable read only memory subtractorprogrammed with said second binary bit combinations to enablesubtraction of said second binary bit combinations from the total sumstored in said latch circuit.
 25. A circuit according to claim 24,whereinsaid latch circuit includesa predetermined number of flip flops.26. A circuit according to claim 25, whereineach of said flip flops is aD-type flip flop.
 27. A circuit according to claim 26, whereinsaidpredetermined number of outputs are the five least significant outputs,and said predetermined number of address inputs are the five leastsignificant address inputs.
 28. A circuit according to claim 27,whereinsaid latch circuit is coupled to the five least significantaddress inputs of said subtractor.
 29. A circuit according to claim 28,whereinsaid second means further includesa tri-state buffer coupled tosaid first means and a given number of address inputs of said adder andsaid subtractor, and a first source of timing signals to sequentiallyenable groups of said buffers to couple each of said plurality of bitsin sequence to said given number of address inputs when said secondmeans is adding and subtracting.
 30. A circuit according to claim 29,whereinsaid given number of address inputs are the three mostsignificant address inputs.
 31. A circuit according to claim 30,whereinsaid second means further includesan intermediate sequentialstorage circuit coupled to the two most significant outputs of saidsubtractor to store sequentially in said intermediate storage circuitthe result of subtraction in said subtractor, and a second source oftiming signals to sequentially control said intermediate storage circuitwhen adding.
 32. A circuit according to claim 31, whereinsaidintermediate storage circuit includesa plurality of flip flops equal innumber to said plurality of phones.
 33. A circuit according to claim 32,whereineach of said flip flops is a JK-type flip flop.
 34. A circuitaccording to claim 33, whereineach of said first and second source oftiming signals includea four-stage Johnson octal counter.
 35. A circuitaccording to claim 34, whereinsaid second means further includesaplurality of output storage circuits equal in number to said pluralityof phones, each of said output storage circuits being coupled to adifferent of said flip flops of said intermediate storage circuit, eachof said output storage circuit providing a different one of saidplurality of conference bit streams.
 36. A circuit according to claim35, whereineach of said plurality of output storage circuits includeaflip flop.
 37. A circuit according to claim 36, whereineach of said flipflops is a D-type flip flop.